Mathematics - 18 December 2007

i'm terrible at math...no matter how much i try i always get it wrong...so yahoo answers is really my last resort. im so much better at science, but unfortunately my quiz isnt in science today :(....if you can help me out here then please please do.

1. Solve the equation and select the letter of the correct answer.

0 = k^2 – 12k + 35
The solution set is {5, 7}.

The solution set is {–5, –7}.

The solution set is {5, –7}.

The solution set is {–5, 7}.


3. Solve the equation and select the letter of the correct answer.

u^5 – 13u^3 + 36u = 0
The solution set is {0, 2, 3}.

The solution set is {–3, –2, 0}.

The solution set is {–3, –2, 2, 3}.

The solution set is {0, –2, 2, –3, 3}.



5. Find an equation in standard form with integral coefficients that has the given solution set.

{–1, 5}

x^2 – 4x – 5 = 0

x^2 + 4x – 5 = 0

x^2 – 4x + 5 = 0

x^2 – x + 5 = 0

2007-12-18 06:35:22 · 6 answers · asked by dani m 1

One more word problem, please help me:

The profit (in dollars) from the expenditure of x thousand dollars on advertising is given by P(x) = 1000 + 32x - 2x^2. Find Marginal profit at following expenditures. Then in each case, say whether firm should increase the expenditure and why.

a.) x = 8

b) x = 6

c) x = 20


Please don't tell me its easy, it is hard for me. Please show work and explain how do it.

2007-12-18 06:07:38 · 5 answers · asked by Anonymous

ok i dont have a clue what these answers are so please help me out im usally ok in math but im stuck on these answers and please dont be rude and answer like an idiot



the mass of a pineaple?
6,700 cm = __ m
explain how the outliner in the data effects the mean
3,2,6,3,5,4,15,4,3

4.1 + c = -1.2

ok those are all the problems i need help with now please answer if you want those ten points answer a real answer dont put something dumb in like 35435 cause that wont help

2007-12-18 06:02:56 · 4 answers · asked by Serena Van der Woodsen 2

2007-12-18 05:56:41 · 3 answers · asked by Anonymous

2007-12-18 05:56:21 · 4 answers · asked by Anonymous

In total the jars contain 21 liter of wine. Each dwarf in turn gives all his wine to the others in equal shares. At the end of the process each dwarf has the same amount of wine as at the start. What was that?

2007-12-18 05:41:33 · 7 answers · asked by Anonymous

how do you do these two problems?

http://img161.imageshack.us/img161/9243/loln00bux5.png

please give an explanation, not just the answer. but an answer would be good too!

2007-12-18 05:30:58 · 4 answers · asked by Anonymous

6x2y4
8x2y4
8xy4
6xy4

2007-12-18 05:26:48 · 10 answers · asked by Anonymous

√6 / √11 + 2

2007-12-18 05:25:31 · 4 answers · asked by . 1

I had a go at this quiz but some of the questions were to hard for me so if your good at maths i would appreteate it if u helped me out thanks.

these are the questions i could not get:
1. This Christmas, your brother Jack is twice as old as your sister Jen. The sum of Jack’s age and three times Jen’s age is 35. How old is Jen?4 years old

2. Dana needs 300 Christmas lights with equal amounts of each of her 4 selected colours. She already has 32 red, 26 green, 9 yellow and no blue. How many more of each colour does Dana need to buy?
If the bulbs cost 25 pence and you get 20% off if you purchase 50 or more of the same colour and 30% off if you purchase 60 or more of one colour, how much does Dana need to spend? Show your working out.

3. Parents donated fudge for the Christmas fund raiser for your classroom. 40 pounds of chocolate fudge sold for £2.15 per pound and vanilla fudge sold for £1.90 per pound. Your class made £158.20. How many pounds of fudge were sold?

4. Justin is making snowballs to build a fort in the Christmas holidays. Justin can build 15 snowballs in an hour but 2 snowballs melt every 15 minutes. How long will it take him to build 210 snowballs?

5. You have 15 meters of ribbon for your Christmas gift boxes. Each box gets the same amount of ribbon. How much ribbon will each of your 20 gift boxes get?

6. You finally have your Christmas shopping money! You put £2.00 away in January, £4.00 away in February, £8.00 away in March, £16.00 away in April and followed this savings pattern through to December. How much money do you have to shop with?

2007-12-18 05:15:01 · 7 answers · asked by night rider 2

Solve by completing the square x2 - 6x - 4 = 0.
-3 +
3 +
-3 + 2
3 + 2

2007-12-18 05:09:42 · 8 answers · asked by Anonymous

2007-12-18 05:09:29 · 6 answers · asked by Anonymous

You are blindfolded before a table. On the table are a very large number of pennies. You are told that 2007 of the pennies are heads up and the rest are tails up. How can you divide the entire set of pennies into two subgroups, each with the same number of heads facing up?

2007-12-18 05:08:39 · 2 answers · asked by BadCompany 1

Math question! Dan wants to paint the walls and ceiling in a room that is 14 feet x 16 ft. with an 8 ft. high ceiling. He will not paint the double doors, which has a measurement of 6ft x 7ft. One gallon of paint will cover 350 square feet. How many gallon of paint will Dan need to buy?

2007-12-18 05:00:33 · 7 answers · asked by Init05 2

228x12
-----------
24
what does the line mean eg x + -

2007-12-18 04:54:20 · 6 answers · asked by bumberclarte 1

How would you express this in simplest form:
(a/6 - a) + (6/a - 6)

Is it 1 or -1?
Or is it (a + 6/6 - a) or (a + 6/a - 6)?

2007-12-18 04:50:59 · 5 answers · asked by Anonymous

what are the steps for this.

2007-12-18 04:46:11 · 6 answers · asked by Raquel - 3

Find (k³ - 3k - 2) ÷ (k - 2)

It is multiple choice, is it:
k^2 + 2k + 1
k + 2
k^2 + 2k + 1 - (4/k - 2)
or
k^2 - 2k - 7 - (16/k - 2)

2007-12-18 04:44:22 · 8 answers · asked by Anonymous

2007-12-18 04:19:39 · 33 answers · asked by cchs.member 1

2007-12-18 04:19:35 · 20 answers · asked by jessi 1

2007-12-18 04:17:29 · 8 answers · asked by jessi 1

2007-12-18 04:06:44 · 14 answers · asked by Anonymous

I need help finding the solution sets to this equations:

1. [32/(x^2-3x+2)]-3 = (x-3)/(x+1)

2. CubeRoot(3x+1) = x-1

3. [5x/(x^2+2x-8)] => 3
note: => means equal or greater than

4. |4x-3|-3>6
note: |4x-3| means the absolute value of 4x-3


Thats all.....thanks

2007-12-18 03:58:41 · 1 answers · asked by RivalMikhail 1

Suppose f(a, b] --> R is continuous, monotonically decreasing, goes to oo as x --> a+ but its improper Riemann integral exists over (a, b]. Like f(x) = 1/sqrt(x) over (0, 1].

Let S_n be a sequence of Riemann sums taken over [a, b], associated with partitions P_n, in such a way that: (1) The norm of P_n (length of the largest interval) --> 0 and (2) For each interval of P_n, the tag point, at which f is evaluated, is its the interval right end point.

Show that S_n --> Int a^b f(x) dx

Are these conditions too rigid? Can any of them be dropped without compromising the conclusion?

Thank you

2007-12-18 03:53:42 · 3 answers · asked by Laura 1

(a) 1
(b) π
(c) π²
(d) π³

2007-12-18 03:47:49 · 12 answers · asked by Alexander 6

A steel reinforcing rod is 12 ft. long and 1" thick in diameter. If a cubic foot of steel weighs 490 lb., how much does the rod weigh (to the nearest pound)?

Can someone explain how to do this?

2007-12-18 03:46:08 · 5 answers · asked by BradleysStar 2

I liked this girl since elementary (girl A) but I hadn't seen her in years (we’re 18). Anyways I found out what her email was was last year through someone. Anyways at this time I started to like another girl (girl B) and that really prevented me from really getting close to the girl from elementary. Anyways I’ve more or less closed with girl B for reasons that I cant tell you it’s a very long story that’s over a year old and its only recently that I’ve concentrated a bit more on girl A. The reason I brought up girl B was because you people would ask what happened between last year and now if you liked girl A. anyways girl A broke up with her bf so I figured I’d see her again as friends. The first time was about 2 weeks ago and she didn’t show up (I know the reason). Then to kind off make it up, she invited me to a club with her friends. When I got there, she was already drunk and everything, so I more or less spent my night making sure nothing happened to here (I didn’t bring her home because I didn’t have the means and her friends were going to do that). More or less, I watched her make out with a guy gong up and going up the stairs and back down and the works. I figured it was something that only happened like once or twice. When I spoke to her the day later (we tried getting in touch before that) she said that she doesn’t go out to clubs often but when she does, that happens. Now I’m wondering what I should do. I still like her but what are my options? And I don’t know if she knows that I like her. Also, I'm finished with girl B. I only mentioned it because that was the only thing holding to go after the other one. And that’s not my point. What I meant to say was she gets drunk even time at clubs so if it exactly like this every time now what would happen when we go out?

2007-12-18 03:41:51 · 6 answers · asked by Anonymous

A farmer has data indicating that if he plants 30 orange trees per acre, each tree will yield an average of 360 oranges. For every additional tree planted, 15 fewer oranges will be produced per tree. How many trees per acre should the farmer plant to maximize his total crop? State both.

2007-12-18 03:40:15 · 2 answers · asked by C'est Comme Un Rêve 3

suppose v=[-3,6] and w=[4,5] . Find 2w-4v

2007-12-18 03:27:23 · 2 answers · asked by warsane b 1

2007-12-18 03:26:27 · 9 answers · asked by Anonymous